.top{ margin:0 auto; width:100%; height:100px; background:#282d36;}

.main{ margin:0 auto; width:1200px;  height:690px; margin-top:10px;}

.main_L{ width:404px; height:690px; float:left; background: RGBA(0,0,0,0.3);}
.main_L .L1{ width:88px; float:left; height:690px; background:#292f39;}
.main_L .L1 ul{ width:100%; }
.main_L .L1 ul li{ width:100%; height:88px; line-height:88px;}
.main_L .L1 ul .one{ background: #424a58;}
.main_L .L1 ul li:hover{ background: #424a58;}
.main_L .L2{ width:280px; height:auto; float:left;overflow-y:scroll; height:690px;}
.main_L .L2 .top{ width:100%; height:160px; background: #424a58; float:left;}
.main_L .L2 .bottom{ width:100%; height:100%; float:left;}
.main_R{ width: 596px; height:690px; float:left; background: #FBFBFB;}




.ad{ margin:0 auto; width:1200px; height:100px;}










<!--������Ч�� S-->
.bellows {
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box;
}
.bellows__header {
	position: relative;
	padding: 15px 20px;
	border: 1px solid #292f39;
	border-width: 0 0 1px;
	background: #424a58;
	color: white;
	-webkit-tap-highlight-color: transparent;
}
.bellows__header:active {
	background: #424a58;
}
 .bellows__header::before, .bellows__header::after {
 content: '';
 position: absolute;
 top: 50%;
 right: 20px;
 z-index: 2;
 display: block;
 width: 16px;
 height: 4px;
 margin-top: -2px;
 background: white;
 pointer-events: none;
 -webkit-transition: -webkit-transform 0.25s ease-in-out;
 transition: transform 0.25s ease-in-out;
}
 .bellows__header::before {
 content: '';
 -webkit-transform: rotate(0deg);
 -ms-transform: rotate(0deg);
 transform: rotate(0deg);
}
 .bellows__header::after {
 -webkit-transform: rotate(90deg);
 -ms-transform: rotate(90deg);
 transform: rotate(90deg);
}
 .bellows__item.bellows--is-open > .bellows__header::before, .bellows__item.bellows--is-opening > .bellows__header::before {
 -webkit-transform: rotate(180deg);
 -ms-transform: rotate(180deg);
 transform: rotate(180deg);
}
 .bellows__item.bellows--is-open > .bellows__header::after, .bellows__item.bellows--is-opening > .bellows__header::after {
 -webkit-transform: rotate(360deg);
 -ms-transform: rotate(360deg);
 transform: rotate(360deg);
}
.bellows__item:last-child > .bellows__header {
	border-bottom: 0;
}
.bellows__header h1,  .bellows__header h2,  .bellows__header h3,  .bellows__header h4 {
	margin: 0; font-size:18px;
}
.bellows__content {
	padding: 20px 10px;
/*border: 1px solid #ecf0f1; */}
.bellows__content .bellows {
	margin-top: 20px;
}
<!--������Ч�� E-->



<!--��ɫЧ�� S-->


<!--��ɫЧ�� E-->




 





